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Ecological Impacts of Human Activities on Nutrient Dynamics

Explore the effects of urban development, agriculture, mining, and other activities on nutrient levels in ecosystems. Learn about the influence on water quality, plant life, and aquatic organisms in this simple conceptual model.

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Ecological Impacts of Human Activities on Nutrient Dynamics

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  1. forestry & silviculture urban development mining & resource extraction channel alteration agriculture land cover alteration industry geology & other natural sources ↑ N or P in surface runoff ↑ N or P in subsurface waters ↑ N or P in wet or dry deposition ↑ N or P in discharged waters source light ↑ N or P in soil ↑ macrophytes ↑ periphyton ↑ phytoplankton ↑ microbes ↑ pH ↑ delivery of N or P to stream ↑ dissolved organic N or P ↑ dissolved inorganic N or P ↑ particulate N or P Δ plant assemblage structure ↑ algal toxins Δ benthic organic matter Δ dissolved oxygen additional step in causal pathway human activity modifying factor Simple conceptual model diagram for NUTRIENTS Developed 7/2007 by Kate Schofield; modified 7/2010 mode of action biologically impaired fish assemblages other biological impairments biologically impaired invertebrate assemblages biotic response ↑ suspended organic matter Δ food resources Δ habitat structure Δ N:P ratio LEGEND interacting stressor proximate stressor

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